Giải thích các bước giải:
`a)`
`2x+27=-11`
`=>2x=-11-27`
`=>2x=-38`
`=>x=-38:2`
`=>x=-19`
Vậy `x=-19`
`b)`
`10x-2x=-25`
`=>x(10-2)=-25`
`=>x.8=-25`
`=>x=-25:8`
`=>x=-25/8`
Vậy `x=-25/8`
`c)`
`x/5=2/3`
`=>x3=5.2`
`=>x3=10`
`=>x=10:3`
`=>x=10/3`
Vậy `x=10/3`
`d)`
`x-12/4=1/2`
`=>x=1/2+12/4`
`=>x=2/4+12/4`
`=>x=14/4`
`=>x=7/2`
Vậy `x=7/2`